Resonant Converter WPT Patents: Who Leads, Filing Trends 2026
- Filing has cooled sharply. activity peaked at 12 families in 2018 and had fallen to zero by the 2022 midpoint, with no meaningful rebound through the current filing year.
- Claim space concentrates in two IPC subclasses. H02J (power supply & grid systems) and H02M (power conversion) cover the large majority of the 48 families, while EV propulsion, magnetics and battery-adjacent claims stay thin.
- Collaboration is rare. only three co-assignee pairs appear across the entire dataset, so most filers are prosecuting alone rather than building joint claim positions.
A narrow, cooling field with concentrated claim territory
Resonant converter wireless power transfer sits at the intersection of resonant DC-DC conversion and inductive or magnetic-resonance coupling for power delivery. The dataset covers 48 patent families filed between 2015 and the 2026 cut-off, drawn from a search string that pairs resonant/LLC converter topology terms with wireless and inductive power transfer terms. This is a small, well-defined corpus rather than a sprawling one, which makes concentration and gaps easier to read directly off the numbers.
Filing rose to a peak of 12 families in 2018, then declined to zero by 2022 and has not recovered. Because publication typically lags filing by around 18 months, the final one or two years understate true filing activity, but the multi-year decline through the midpoint is a real signal, not an artefact of the lag.
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Filing trend and technology composition
Two views of the same 48-family dataset: how filing activity moved year over year, and where those families sit across the IPC classification system.
A peak in 2018, then a steep drop-off
Filings ran at 10 in 2017 and climbed to a peak of 12 in 2018. By the 2022 midpoint annual filing had fallen to zero, and it has stayed flat since — a pattern consistent with a technology area that had its main wave of claim-staking finish several years ago rather than one still building momentum.
H02J and H02M dominate; adjacent classes are thin
45 of 48 families touch H02J (power supply & grid systems) and 28 touch H02M (power conversion), confirming the corpus is squarely a power-electronics story. B60L (EV propulsion, 6 records), H01F (magnetics, 3 records), H01M (batteries, 1 record) and H04B (transmission, 1 record) each appear in only a handful of families, marking those as adjacent rather than core claim territory.
Shares are the percentage of the 48 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Resonant Converter Wireless Power Transfer with Eureka
This page is one run against one query. Ask Eureka your own question about resonant converter wireless power transfer and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited prior art in this corpus
US10075086B2 — Inductive power transfer converters and system
An IPT system for wireless power transfer is provided, in particular an IPT system capable of operating at high frequencies. In one aspect there is provided an IPT transmitter comprising a push-pull resonant converter having a resonant frequency and configured to operate at a switching frequency below the resonant frequency and dependent on a switching characteristic of a second converter configured to inductively couple to said transmitter.Filed by Auckland UniServices Limited, granted 2018-09-11.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20140225439A1 | High Efficiency High Frequency Resonant Power Conversion | 169 |
| 2 | US20140347008A1 | Wireless power transmitter and wireless power transfer method thereof | 95 |
| 3 | US9919610B1 | Wireless power electronics and controls | 56 |
| 4 | US20200290467A1 | Wireless charging of electric vehicles | 55 |
| 5 | US20200287413A1 | Capacitive wireless power transfer by means of adaptive matching networks | 41 |
| 6 | WO2017165549A1 | Wireless charging of electric vehicles | 36 |
| 7 | US9755534B2 | High efficiency high frequency resonant power conversion | 19 |
| 8 | CN111279577A | 借助于自适应匹配网络的电容性无线电力传输 | 18 |
| 9 | EP2808972A1 | Wireless power transmitter and wireless power transfer method thereof | 13 |
| 10 | US20180194237A1 | Wireless power electronics and controls | 12 |
Citation counts are drawn from the searched corpus and skew toward older filings; treat them as a marker of influence on subsequent filers, not of current commercial relevance.
Patent titles are shown in the language they were filed in, not translated, so that each record stays verifiable against the original filing — a translated title will not match in Eureka or in any national register. Each row carries its publication number; clicking a row searches Eureka by that number.
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Browse MCP servers →What the numbers mean for a filing decision
Three read-throughs from the trend, the citation table and the assignee data, framed for someone deciding where to file or who to watch.
The main filing wave has passed
Annual filings peaked at 12 in 2018 and fell to zero by 2022, with no assignee in the recent-momentum data showing activity in the latest year. That does not mean the technology is dead — it means the dominant assignees staked their core claims years ago and have not returned to file follow-on families since.
Power-supply claims are the crowded ground
H02J and H02M together account for the bulk of this corpus. A new filer targeting core resonant-converter or coupling-network claims in these subclasses is filing into dense prior art; the more open ground sits in the thinly populated adjacent classes.
Filers mostly act alone
Only three co-assignee pairings appear across the dataset, the strongest being a two-person pairing filing together three times. Joint filing is the exception here, which suggests most competitive positioning happens through solo prosecution rather than through university-industry or cross-licensing partnerships.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to resonant converter wireless power transfer, with the prior art for and against each one.
A short list of named assignees, none currently active
The assignee set spans university tech-transfer entities, a national research foundation, and several corporate filers, but the recent-momentum data shows every one of them at zero filings in the latest tracked year.
No current front-runner
Every named assignee in the recent-momentum table — spanning university, corporate and national-lab affiliations — shows zero filings in the latest year. Leadership in this dataset is therefore a matter of historical filing volume, not present activity.
University tech-transfer offices hold foundational claims
The representative record in this corpus, covering push-pull resonant converter operation below resonant frequency, is assigned to a university technology-transfer office rather than a corporate R&D arm — a pattern common in inductive power transfer, where early foundational work originated in academic labs.
Individual-inventor pairs, not corporate alliances
The strongest co-assignee relationship in the dataset is a pairing of two named individuals filing together three times, rather than a joint venture between two corporations. This points to small, specialist filing teams rather than large coordinated R&D programmes as the source of the corpus's most repeated collaboration.
| Assignee | Recent year | YoY |
|---|---|---|
| B.G. Negev Technologies and Applications Ltd. | 0 | — |
| Auckland UniServices Limited | 0 | — |
| LG Electronics Inc. | 0 | — |
| CAPOW TECH LTD | 0 | — |
| Voltafield Technology | 0 | — |
| University of Georgia Research Foundation, Inc. | 0 | — |
| SARWAT ARIF | 0 | — |
| MOGHADDAMI MASOOD | 0 | — |
Where to take this analysis
The trend and assignee data point to a field past its main filing wave, but the adjacent classes and the underlying claims are worth checking in detail before assuming the ground is settled.
Read the claims behind the citation leaders
The most-cited records in this corpus, several with citation counts well into the double digits, shaped how later filers defined resonant conversion and coupling terms. Reading their independent claims clarifies what language is already occupied.
Explore citation leaders in EurekaCheck the thin IPC branches for real white space
B60L, H01F, H01M and H04B each carry only a handful of records. That can mean genuine white space or simply that filers classify differently — worth confirming with a targeted claim-scope search.
Run a white-space search in EurekaTrack whether filing activity restarts
With every listed assignee at zero in the latest year, the open question is whether this is a mature, closed field or one waiting for a new wireless-power application to trigger a fresh filing wave.
Set up monitoring in EurekaCommon questions about this landscape
In this 48-family dataset, filing activity is spread across a handful of named assignees including university tech-transfer entities and corporate filers, with no single assignee showing current-year activity. Historical filing volume, rather than recent momentum, is what separates the leading names here. Anyone assessing current market position should treat this as a snapshot of past claim-staking and verify recent filings in a live database, since publication lag means the most recent one to two years are undercounted in any patent dataset.
Slowing, based on the trend in this dataset: filings peaked at 12 families in 2018 and had fallen to zero by 2022, with no rebound through the current filing year. That decline through the midpoint is too large to be explained by publication lag alone, though the final year or two of any dataset is always undercounted because publication trails filing by roughly 18 months. The pattern reads as a field that had its main wave of claim-staking finish several years ago.
H02J, covering power supply and grid systems, appears in 45 of the 48 families in this corpus, and H02M, covering power conversion, appears in 28. Those two subclasses represent the core claim territory. Adjacent classes — B60L for EV propulsion, H01F for magnetic components, H01M for batteries, and H04B for transmission — each carry only a handful of records, marking them as thinner, more open ground rather than core contested territory.
US10075086B2, assigned to Auckland UniServices Limited, claims an inductive power transfer transmitter built around a push-pull resonant converter operated at a switching frequency below its resonant frequency, with that switching frequency dependent on a characteristic of a second, inductively coupled converter. It is a foundational-style claim around a specific frequency-control relationship between transmitter and receiver converters, not a blanket claim over resonant WPT generally. A new design that uses a different frequency-control scheme, a non-push-pull topology, or operates at or above resonant frequency has a plausible design-around path, though any real freedom-to-operate opinion needs a full claim chart against the granted claims, not the abstract.
The thinly populated IPC branches in this corpus — B60L (EV propulsion overlap), H01F (magnetic component design), H01M (battery-side interface circuits) and H04B (data/power channel coexistence) — each carry only one to six records against 45 for the core H02J class. That gap suggests under-claimed ground in EV-side integration, coupling-network magnetics, battery-facing resonant interfaces, and combined power-and-data links. Low record counts can also reflect classification habits rather than true openness, so any white-space claim should be confirmed with a targeted search before committing filing resources.
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Disclaimer. This page is generated from Patsnap Eureka data drawn from a limited snapshot of global patent and scientific-literature records, and is provided for general information and reference only.
Patent data carries inherent limitations: recent filings (typically the most recent 18–24 months) are under-counted due to standard publication lag; counts may be reported at either a patent-family or a patent-record basis and are not always directly comparable; classification, applicant-name, and citation data may contain errors, duplicates, or omissions; and the underlying search query defines and constrains the scope shown. As a result, the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing on this page constitutes an exhaustive prior-art, novelty, freedom-to-operate, or validity search, nor does it constitute legal, financial, investment, or professional advice, and it should not be relied upon as such. Any patent, commercial, or strategic decision should be verified independently and reviewed with qualified patent, legal, and domain professionals. Patsnap makes no warranties, express or implied, as to the accuracy, completeness, or fitness for any particular purpose of the information presented.
Machine translation. Assignee and organisation names originally recorded in Chinese, Japanese or Korean have been rendered into English by an AI translation step so that the tables stay readable. These renderings are best-effort and may not match a company’s registered English name; the original name is what the underlying patent record carries, and it is what any Eureka query launched from this page uses.